In rows 1 and 3 the pattern itself is between *. If i understand correctly, the pattern consists of 3 sts. You have K2, then *pattern* then K1. So 132 sts -3 (border sts) =129. 129/3=43. That means that the pattern repeats 43 times. You can make less repeats and make the blanket a narrow one. You just have to CO 3 sts+ 3X? to keep the pattern correct.
I hope i did the right math